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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 129 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.8 + ? = 10
  2. 2.1 + ? = 10
  3. 3.9 + ? = 10
  4. 4.3 + ? = 10
  5. 5.33 + ? = 100
  6. 6.7 + ? = 10
  7. 7.4 + ? = 10
  8. 8.26 + ? = 100
  9. 9.45 + ? = 100
  10. 10.57 + ? = 100
  11. 11.82 + ? = 100
  12. 12.5 + ? = 10
  13. 13.34 + ? = 100
  14. 14.50 + ? = 100
  15. 15.17 + ? = 100
  16. 16.48 + ? = 100
  17. 17.38 + ? = 100
  18. 18.31 + ? = 100
  19. 19.36 + ? = 100
  20. 20.43 + ? = 100
  21. 21.2 + ? = 10
  22. 22.12 + ? = 100
  23. 23.39 + ? = 100
  24. 24.56 + ? = 100
  25. 25.53 + ? = 100
  26. 26.68 + ? = 100
  27. 27.28 + ? = 100
  28. 28.88 + ? = 100
  29. 29.76 + ? = 100
  30. 30.6 + ? = 10
  31. 31.21 + ? = 100
  32. 32.60 + ? = 100
  33. 33.61 + ? = 100
  34. 34.66 + ? = 100
  35. 35.63 + ? = 100
  36. 36.25 + ? = 100
  37. 37.59 + ? = 100
  38. 38.64 + ? = 100
  39. 39.19 + ? = 100
  40. 40.27 + ? = 100

Answer key

  1. 2
  2. 9
  3. 1
  4. 7
  5. 67
  6. 3
  7. 6
  8. 74
  9. 55
  10. 43
  11. 18
  12. 5
  13. 66
  14. 50
  15. 83
  16. 52
  17. 62
  18. 69
  19. 64
  20. 57
  21. 8
  22. 88
  23. 61
  24. 44
  25. 47
  26. 32
  27. 72
  28. 12
  29. 24
  30. 4
  31. 79
  32. 40
  33. 39
  34. 34
  35. 37
  36. 75
  37. 41
  38. 36
  39. 81
  40. 73

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